Question

Length and width

Answer 1

@johnweldon1993

Answer 2

height is w +S 6
width is w
and l is 30

and V is 8400

Length X Width X Height = Volume

plug in the values
30* w * (w+6) = 8400

w^2 + 6w = 8400/30

w^2 + 6w - 280 = 0
here you factor and solve for w

can you see it now??